“As you can imagine all our thoughts and prayers at this moment are with Sean and his family,” said the Reds boss, who at his pre-match press conference wore a Liverbird badge in the colours of the Irish tricolour in support of Cox and his family.

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“I think the game on Tuesday showed the beauty of the game during the game and showed it’s most ugly face of parts of the game before the game.

“When I first heard of it I cannot describe my emotions in English. It should never have happened, it should never have happened before and it should not happen in the future and we all have to do everything to make sure things like that will not happen any more.

“I obviously don’t have the solution for it, probably no-one has that, but it is unbelievable that something like this can happen.”

Jurgen Klopp, Manager of Liverpool reacts during the Premier League match between Manchester United and Liverpool at Old Trafford on March 10, 2018 in Manchester, England. (Photo by Michael Regan/Getty Images)

On fan behaviour and the suggestion there could be more trouble involving Liverpool supporters, Klopp said: “Since I’ve been here I’ve never heard anything about that. I can’t remember anything like that.

“Of course it is difficult to police but the police, as I understand, will do the job.

“It is common sense. What can I say which they don’t already know and if I say it would that change it?